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Efficient Frequency Spectrum Utilization. Date: 2013-05-13. Authors:. Discussion result on the previous meeting Straw Poll: Do you support starting a new study group called “high efficiency WLAN” to enhance 802.11 PHY and MAC in 2.4 and 5GHz with a focus on:

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Efficient frequency spectrum utilization
Efficient Frequency Spectrum Utilization

Date: 2013-05-13

Authors:

Yongho Seok, LG Electronics


Background

  • Discussion result on the previous meeting

    Straw Poll: Do you support starting a new study group called “high efficiency WLAN” to enhance 802.11 PHY and MAC in 2.4 and 5GHz with a focus on:

    • Improving spectrum efficiency and area throughput

    • Improving real world performance in indoor and outdoor deployments

      • in the presence of interfering sources, dense heterogeneous networks

      • in moderate to heavy user loaded APs

Background

Yongho Seok, LG Electronics


Introduction

Regarding a frequency spectrum of HEW SG, an initial consensus looks like covering both 2.4GHz and 5GHz.

The discussion for opening the new unlicensed frequency spectrum in 5GHz has been ongoing in IEEE 802.11 REG SC and Wi-Fi Alliance Spectrum & Regulatory TG.

In this presentation, we would like to discuss the usage scenario of the newly opened frequency spectrum in 5GHz.

Introduction

Yongho Seok, LG Electronics


Band plan with new spectrum importance of additional spectrum 1

  • Wide bandwidth channels desired to support high throughput requirements

  • At the same time, large number non-overlapping channels desired to support high QoS requirements

    • To avoid co-channel interference

  • Current UNII spectrum allows only

    • Six 80 MHz channels

    • Two 160 MHz channels

  • Additional unlicensed use of 5.35-5.47 GHz and 5.85-5.925 GHz would allow

    • Nine 80 MHz channels

    • Four 160 MHz channels

Band plan with new spectrum Importance of Additional Spectrum [1]

New channels

Currently available channels

36

40

44

48

52

56

60

64

68

72

76

80

84

88

92

96

100

104

108

112

116

120

124

128

132

136

140

144

149

153

157

161

165

169

173

177

181

IEEE channel #

20 MHz

40 MHz

80 MHz

160 MHz

UNII-1

UNII-2

NEW

UNII-2

UNII-3

NEW

5250

MHz

5350

MHz

5470

MHz

5725

MHz

5825

MHz

5925

MHz

Yongho Seok, LG Electronics


Frequency spectrum usage scenario

  • Terminologies requirements

    • Legacy frequency spectrum: currently available unlicensed frequency spectrum

    • Legacy STA : it supports only the legacy frequency spectrum and it does not support the newly opened frequency spectrum

    • HEW STA and AP: it supports both the legacy frequency spectrum and the newly opened frequency spectrum

  • Scenario 1) The primary channel of HEW AP is located in the newly opened frequency spectrum

  • Scenario 2) The primary channel of HEW AP is located in the legacy frequency spectrum

Frequency Spectrum Usage Scenario

Yongho Seok, LG Electronics


Frequency spectrum usage analysis 1 2

  • If the primary channel of HEW AP is located in the newly opened frequency spectrum

    • Pros: The spectrum efficiency of the newly opened frequency spectrum is the most optimized.

    • Cons: The legacy STA is not supported. For supporting the legacy STA, AP shall have multiple radio interfaces.

Frequency Spectrum Usage Analysis (1/2)

HEW BSS Operation (20MHz/40MHz/80MHz/160MHz)

20 MHz

40 MHz

80 MHz

160 MHz

UNII-1

UNII-2

NEW

UNII-2

UNII-3

NEW

5250

MHz

5350

MHz

5470

MHz

5725

MHz

5825

MHz

5925

MHz

Yongho Seok, LG Electronics


Frequency spectrum usage analysis 2 2

  • If the primary channel of AP is located in the legacy frequency spectrum

    • Pros: AP can easily support both legacy STA and HEW STA.

    • Cons: The newly opened spectrum is used only for a secondary “X” MHz channel. So, it is hard to fully utilize the newly opened frequency spectrum.

Frequency Spectrum Usage Analysis (2/2)

HEW BSS Operation (20MHz/40MHz/80MHz/80+80MHz)

20 MHz

40 MHz

80 MHz

160 MHz

UNII-1

UNII-2

NEW

UNII-2

UNII-3

NEW

5250

MHz

5350

MHz

5470

MHz

5725

MHz

5825

MHz

5925

MHz

Yongho Seok, LG Electronics


Discussion

Discussion

HEW BSS Operation (20MHz/40MHz/80MHz/20+20MHz/40+40MHz/80+80MHz)

20 MHz

40 MHz

80 MHz

160 MHz

UNII-1

UNII-2

NEW

UNII-2

UNII-3

NEW

5250

MHz

5350

MHz

5470

MHz

5725

MHz

5825

MHz

5925

MHz

Yongho Seok, LG Electronics


Discussion1

FDMA newly opened frequency spectrum

Discussion

PHY Preamble

DATA

(HEW AP  HEW STA)

PHY Preamble

DATA

(HEW AP HEW STA)

Newly OpenedFrequency Spectrum

PHY Preamble

DATA

(HEW AP  Legacy STA)

PHY Preamble

DATA

(HEW AP Legacy STA)

Legacy Frequency Spectrum

Downlink FDMA

Uplink FDMA

Yongho Seok, LG Electronics


Conclusion

  • It is expected that new unlicensed frequency spectrum will be opened in the near future

  • At this moment, available solution for supporting both the legacy frequency spectrum and the newly opened frequency spectrum is to use two different radio interfaces

  • But, in the future, it is important to improve the utilization of the newly opened frequency spectrum with a low cost

Conclusion

Legacy BSS(1st interface)

HEW BSS(2nd interface)

20 MHz

40 MHz

80 MHz

160 MHz

UNII-1

UNII-2

NEW

UNII-2

UNII-3

NEW

Yongho Seok, LG Electronics


References

[1] https://mentor.ieee.org/802.11/dcn/13/11-13-0282-03-0000-802-5-ghz-tutorial.pptx

References

Yongho Seok, LG Electronics


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